Is there any kind of material which when placed between the plates of capacitor reduces its capacitance ?

Explanation

To answer the question of whether there is any kind of material that, when placed between the plates of a capacitor, reduces its capacitance, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Capacitance**:
- Capacitance (C) of a capacitor is defined as the ability of the capacitor to store charge per unit voltage. The formula for capacitance is given by:
\[
C = \frac{\varepsilon A}{d}
...